hondacrx
308 lines
10 KiB
C#
308 lines
10 KiB
C#
// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
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// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
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using System;
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using System.Numerics;
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using System.Runtime.Serialization;
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namespace Framework.GameMath
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{
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/// <summary>
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/// Represents an axis aligned box in 3D space.
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/// </summary>
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/// <remarks>
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/// An axis-aligned box is a box whose faces coincide with the standard basis axes.
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/// </remarks>
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[Serializable]
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public struct AxisAlignedBox : ISerializable, ICloneable
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{
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#region Private Fields
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private Vector3 _lo;
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private Vector3 _hi;
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="AxisAlignedBox"/> class using given minimum and maximum points.
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/// </summary>
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/// <param name="min">A <see cref="Vector3"/> instance representing the minimum point.</param>
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/// <param name="max">A <see cref="Vector3"/> instance representing the maximum point.</param>
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public AxisAlignedBox(Vector3 min, Vector3 max)
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{
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_lo = min;
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_hi = max;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="AxisAlignedBox"/> class using given values from another box instance.
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/// </summary>
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/// <param name="box">A <see cref="AxisAlignedBox"/> instance to take values from.</param>
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public AxisAlignedBox(AxisAlignedBox box)
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{
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_lo = box.Lo;
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_hi = box.Hi;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="AxisAlignedBox"/> class with serialized data.
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/// </summary>
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/// <param name="info">The object that holds the serialized object data.</param>
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/// <param name="context">The contextual information about the source or destination.</param>
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private AxisAlignedBox(SerializationInfo info, StreamingContext context)
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{
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_lo = (Vector3)info.GetValue("Min", typeof(Vector3));
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_hi = (Vector3)info.GetValue("Max", typeof(Vector3));
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}
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#endregion
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#region Public Properties
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/// <summary>
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/// Gets or sets the minimum point which is the box's minimum X and Y coordinates.
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/// </summary>
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public Vector3 Lo
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{
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get { return _lo; }
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set { _lo = value; }
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}
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/// <summary>
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/// Gets or sets the maximum point which is the box's maximum X and Y coordinates.
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/// </summary>
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public Vector3 Hi
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{
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get { return _hi; }
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set { _hi = value; }
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}
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#endregion
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#region ISerializable Members
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/// <summary>
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/// Populates a <see cref="SerializationInfo"/> with the data needed to serialize the target object.
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/// </summary>
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/// <param name="info">The <see cref="SerializationInfo"/> to populate with data. </param>
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/// <param name="context">The destination (see <see cref="StreamingContext"/>) for this serialization.</param>
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//[SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
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public void GetObjectData(SerializationInfo info, StreamingContext context)
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{
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info.AddValue("Max", _hi, typeof(Vector3));
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info.AddValue("Min", _lo, typeof(Vector3));
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}
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#endregion
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#region ICloneable Members
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/// <summary>
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/// Creates an exact copy of this <see cref="AxisAlignedBox"/> object.
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/// </summary>
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/// <returns>The <see cref="AxisAlignedBox"/> object this method creates, cast as an object.</returns>
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object ICloneable.Clone()
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{
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return new AxisAlignedBox(this);
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}
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/// <summary>
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/// Creates an exact copy of this <see cref="AxisAlignedBox"/> object.
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/// </summary>
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/// <returns>The <see cref="AxisAlignedBox"/> object this method creates.</returns>
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public AxisAlignedBox Clone()
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{
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return new AxisAlignedBox(this);
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// Computes the box vertices.
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/// </summary>
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/// <returns>An array of <see cref="Vector3"/> containing the box vertices.</returns>
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public Vector3[] ComputeVertices()
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{
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Vector3[] vertices = new Vector3[8];
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vertices[0] = _lo;
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vertices[1] = new Vector3(_hi.X, _lo.Y, _lo.Z);
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vertices[2] = new Vector3(_hi.X, _hi.Y, _lo.Z);
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vertices[3] = new Vector3(_lo.X, _hi.Y, _lo.Z);
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vertices[4] = new Vector3(_lo.X, _lo.Y, _hi.Z);
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vertices[5] = new Vector3(_hi.X, _lo.Y, _hi.Z);
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vertices[6] = _hi;
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vertices[7] = new Vector3(_lo.X, _hi.Y, _hi.Z);
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return vertices;
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}
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#endregion
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#region Overrides
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/// <summary>
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/// Returns the hashcode for this instance.
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/// </summary>
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/// <returns>A 32-bit signed integer hash code.</returns>
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public override int GetHashCode()
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{
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return _lo.GetHashCode() ^ _hi.GetHashCode();
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}
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/// <summary>
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/// Returns a value indicating whether this instance is equal to
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/// the specified object.
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/// </summary>
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/// <param name="obj">An object to compare to this instance.</param>
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/// <returns>True if <paramref name="obj"/> is a <see cref="Vector3"/> and has the same values as this instance; otherwise, False.</returns>
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public override bool Equals(object obj)
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{
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if (obj is AxisAlignedBox)
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{
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AxisAlignedBox box = (AxisAlignedBox)obj;
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return (_lo == box.Lo) && (_hi == box.Hi);
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}
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return false;
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}
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/// <summary>
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/// Returns a string representation of this object.
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/// </summary>
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/// <returns>A string representation of this object.</returns>
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public override string ToString()
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{
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return $"AxisAlignedBox(Min={_lo}, Max={_hi})";
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}
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#endregion
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#region Comparison Operators
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/// <summary>
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/// Checks if the two given boxes are equal.
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/// </summary>
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/// <param name="a">The first of two boxes to compare.</param>
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/// <param name="b">The second of two boxes to compare.</param>
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/// <returns><b>true</b> if the boxes are equal; otherwise, <b>false</b>.</returns>
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public static bool operator ==(AxisAlignedBox a, AxisAlignedBox b)
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{
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if (Equals(a, null))
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{
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return Equals(b, null);
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}
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if (Equals(b, null))
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{
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return Equals(a, null);
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}
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return (a.Lo == b.Lo) && (a.Hi == b.Hi);
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}
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/// <summary>
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/// Checks if the two given boxes are not equal.
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/// </summary>
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/// <param name="a">The first of two boxes to compare.</param>
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/// <param name="b">The second of two boxes to compare.</param>
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/// <returns><b>true</b> if the vectors are not equal; otherwise, <b>false</b>.</returns>
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public static bool operator !=(AxisAlignedBox a, AxisAlignedBox b)
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{
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if (Object.Equals(a, null) == true)
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{
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return !Object.Equals(b, null);
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}
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else if (Object.Equals(b, null) == true)
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{
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return !Object.Equals(a, null);
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}
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return !((a.Lo == b.Lo) && (a.Hi == b.Hi));
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}
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#endregion
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public bool contains(Vector3 point)
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{
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return
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(point.X >= _lo.X) &&
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(point.Y >= _lo.Y) &&
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(point.Z >= _lo.Z) &&
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(point.X <= _hi.X) &&
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(point.Y <= _hi.Y) &&
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(point.Z <= _hi.Z);
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}
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public void merge(AxisAlignedBox a)
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{
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Lo = Vector3.Min(_lo, a.Lo);
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Hi = Vector3.Max(Hi, a.Hi);
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}
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public void merge(Vector3 a)
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{
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_lo = Vector3.Min(_lo, a);
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_hi = Vector3.Max(_hi, a);
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}
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public static AxisAlignedBox Zero()
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{
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return new AxisAlignedBox(Vector3.Zero, Vector3.Zero);
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}
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public Vector3 corner(int index)
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{
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// default constructor inits all components to 0
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Vector3 v = new();
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switch (index)
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{
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case 0:
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v.X = _lo.X;
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v.Y = _lo.Y;
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v.Z = _hi.Z;
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break;
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case 1:
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v.X = _hi.X;
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v.Y = _lo.Y;
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v.Z = _hi.Z;
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break;
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case 2:
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v.X = _hi.X;
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v.Y = _hi.Y;
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v.Z = _hi.Z;
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break;
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case 3:
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v.X = _lo.X;
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v.Y = _hi.Y;
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v.Z = _hi.Z;
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break;
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case 4:
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v.X = _lo.X;
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v.Y = _lo.Y;
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v.Z = _lo.Z;
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break;
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case 5:
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v.X = _hi.X;
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v.Y = _lo.Y;
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v.Z = _lo.Z;
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break;
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case 6:
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v.X = _hi.X;
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v.Y = _hi.Y;
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v.Z = _lo.Z;
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break;
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case 7:
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v.X = _lo.X;
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v.Y = _hi.Y;
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v.Z = _lo.Z;
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break;
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default:
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break;
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}
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return v;
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}
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public static AxisAlignedBox operator +(AxisAlignedBox box, Vector3 v)
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{
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AxisAlignedBox outt = new();
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outt.Lo = box.Lo + v;
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outt.Hi = box.Hi + v;
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return outt;
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}
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}
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}
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